Issue #23985: Fix a possible buffer overrun when deleting a slice from the front...

Patch by Martin Panter.

diff --cc Lib/test/test_bytes.py
Simple merge

diff --cc Misc/NEWS
index 3d8e3166a9471d6dc5c37a007257dfb0b9cc0d8e,45a0639794319b1815f5e1c1c748ea7f9c8098bc..63e4329cbaf323abeab949fe3b1ac6c9e5dbaddf
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -10,16 -10,11 +10,19 @@@ Release date: 2015-05-2
  Core and Builtins
  -----------------
  
+ - Issue #23985: Fix a possible buffer overrun when deleting a slice from
+   the front of a bytearray and then appending some other bytes data.
+ 
  - Issue #24102: Fixed exception type checking in standard error handlers.
  
 +- Issue #15027: The UTF-32 encoder is now 3x to 7x faster.
 +
 +- Issue #23290:  Optimize set_merge() for cases where the target is empty.
 +  (Contributed by Serhiy Storchaka.)
 +
 +- Issue #20274: When calling a _sqlite.Connection, it now complains if passed
 +  any keyword arguments.  Previously it silently ignored them.
 +
  - Issue #20274: Remove ignored and erroneous "kwargs" parameters from three
    METH_VARARGS methods on _sqlite.Connection.
  

diff --cc Objects/bytearrayobject.c
Simple merge